Ask for the anonymized file, and give shared links a preview

[MaxWinterstein]

The issue form

The page tells people to download the anonymized copy and open an issue — and nothing on the GitHub side asked for it, or warned against the raw export. A raw Garmin export carries a name, weight, height, resting heart rate, a watch serial and the exact time of the swim.

So the warning is the first thing in the form, above the upload box rather than below it, and it says out loud that the repository is public.

It also asks how you use the lap button. That isn't form-filling courtesy — it's the project's central ambiguity. Nothing in a file distinguishes "many phantom turns" from "a different lapping habit"; the lap-structure finding exists precisely because the data cannot settle it, and the swimmer is the only one who knows. AGENTS.md says as much.

The site's "open an issue" link now points at issues/new/choose, so the form is actually reachable from where people are told to go.

Link previews

Open Graph tags, so a shared link renders as a card instead of a bare URL.

• Absolute URLs — a crawler resolves these with no document base, so a relative path silently yields no image.
• A committed PNG, not the SVG banner — no major crawler renders SVG for a preview card.
• Pre-rendered with the typeface named explicitly, so the asset doesn't depend on the fonts of whatever machine produced it.
• Flat background, not the banner's gradient. The gradient version encoded to 303 kB, over the 256 kB ceiling check-added-large-files enforces. Flat comes to 38 kB.

No CSP change was needed: og.png is same-origin, which the existing img-src 'self' already covers. I checked rather than assumed.

Also done, outside this diff

Topics are now set on the repo (gh repo edit): added garmin-connect, forerunner, pool-swimming, javascript, zero-dependencies, client-side, vibe-coding to the existing four.

The social preview still needs you. GitHub's social preview image cannot be set through the API or gh — it's Settings → General → Social preview, and web/og.png in this PR is exactly the 1280×640 asset to upload there.

Verification

• check-yaml (the repo's own prek hook) passes on the form
• meta tags read back from the rendered DOM, all seven correct
• og.png serves from the built site at 200, and build-web.mjs picks it up with no change, since web/ is copied wholesale
• functional browser suite still green, no console errors
• task check: 79 tests, lint, privacy scan, build

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 862e5aa and 4a8fa6d.

⛔ Files ignored due to path filters (1)

• web/og.png is excluded by !**/*.png

📒 Files selected for processing (2)

• .github/ISSUE_TEMPLATE/wrong-numbers.yml
• web/index.html

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